Focal clonic seizure (HP_0002266, a Human Phenotype Ontology term) can be described as follows. A focal clonic seizure is a type of focal motor seizure characterized by sustained rhythmic jerking, that is regularly repetitive. Also known as: Focal clonic seizures, Localised clonic seizure, Localized clonic seizure, Partial clonic seizure, Segmental clonic seizure.